An informed MMSE filter based on multiple instantaneous direction-of-arrival estimates

Sound acquisition in noisy and reverberant conditions where the acoustic scene changes rapidly remains a challenging task. In this work, we consider the problem of obtaining a desired, arbitrary spatial response for at most L sound sources being simultaneously active per time-frequency instant. We propose a minimum mean-squared error spatial filter that adapts quickly to changes in the acoustic scene by incorporating instantaneous parametric information on the sound field. In addition, an estimator for the power spectral densities of the L sources is developed that exhibits a sufficiently high temporal and spectral resolution to achieve both dereverberation and noise reduction. Simulation results demonstrate that a strong attenuation of undesired noise and interfering components can be achieved with a tolerable amount of signal distortion.